<!DOCTYPE html>
<html lang="en-US">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <script type="text/javascript" include="randomcolor" src="../js/include-web.js"></script>
    <script type="text/javascript" src="../../dist/include-openlayers.js"></script>
    <title>webgl渲染</title>
    <style>
        .ol-popup {
            position: absolute;
            background-color: white;
            -webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
            filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
            padding: 15px;
            border-radius: 10px;
            border: 1px solid #cccccc;
            bottom: 12px;
            left: -50px;
            min-width: 50px;
        }

        .ol-popup:after, .ol-popup:before {
            top: 100%;
            border: solid transparent;
            content: " ";
            height: 0;
            width: 0;
            position: absolute;
            pointer-events: none;
        }

        .ol-popup:after {
            border-top-color: white;
            border-width: 10px;
            left: 48px;
            margin-left: -10px;
        }

        .ol-popup:before {
            border-top-color: #cccccc;
            border-width: 11px;
            left: 48px;
            margin-left: -11px;
        }
    </style>
</head>
<body style=" margin: 0;overflow: hidden;background: #fff;width: 100%;height:100%">
<div id="map" style="width: 100%;height:100%"></div>
<div id="popup" class="ol-popup">
    <div id="popup-content"></div>
</div>
<script type="text/javascript">
    var url = (window.isLocal ? document.location.host : "http://support.supermap.com.cn:8090") + "/iserver/services/map-china400/rest/maps/China_4326";
    var colorCount = 10;
    var colors = getRandomColors(colorCount);
    new ol.supermap.MapService(url).getMapInfo(function (serviceResult) {
        var mapJSONObj = serviceResult.result;
        var container = document.getElementById('popup');
        var content = document.getElementById('popup-content');
        var overlay = new ol.Overlay(({
            element: container,
            autoPan: true,
            autoPanAnimation: {
                duration: 250
            }
        }));
        var map = new ol.Map({
            target: 'map',
            controls: ol.control.defaults({attributionOptions: {collapsed: false}})
                .extend([new ol.supermap.control.Logo()]),
            view: new ol.View({
                center: [0, 0],
                zoom: 2,
                projection: 'EPSG:4326'
            }),
            overlays: [overlay],
            renderer: ['webgl']
        });
        var options = ol.source.TileSuperMapRest.optionsFromMapJSON(url, mapJSONObj);
        var layer = new ol.layer.Tile({
            source: new ol.source.TileSuperMapRest(options)
        });
        map.addLayer(layer);

        var randomCircleStyles = [];
        for (var i = 0; i < colorCount; i++) {
            randomCircleStyles.push(new ol.style.Circle({
                radius: Math.floor(Math.random() * 15 + 1),
                fill: new ol.style.Fill({
                    color: colors[i]
                }),
                stroke: new ol.style.Stroke({
                    color: colors[i]
                }),
            }));
        }

        var count = 100000;    //矢量点的个数
        var graphics = new Array(count);
        var e = 45;
        for (var i = 0; i < count; ++i) {
            var coordinates = [2 * e * Math.random() - e, 2 * e * Math.random() - e];
            graphics[i] = new ol.Graphic(new ol.geom.Point(coordinates));
            graphics[i].setStyle(randomCircleStyles[Math.floor(Math.random() * colorCount)]);
        }
        map.once('postrender', function () {
            var graphicLayer = new ol.layer.Image({
                source: new ol.source.Graphic({
                    graphics: graphics,
                    map: map,
                    onClick: function (graphic) {
                        if (graphic) {
                            var coords = graphic.getGeometry().getCoordinates();
                            content.innerHTML = "坐标为:[" + coords[0] + "," + coords[1] + "]";
                            overlay.setPosition(graphic.getGeometry().getCoordinates());
                            return;
                        }
                        overlay.setPosition(undefined);
                    }
                })
            });
            map.addLayer(graphicLayer);
        })
    });

    function getRandomColors(count) {
        return randomColor({
            luminosity: 'bright',
            hue: 'random',
            alpha: 0.5,
            format: 'rgba',
            count: count
        });
    }
</script>
</body>
</html>
